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They are open for the 3cx system. But I found out that they need to be open for the phone also. (which I find very strange, isn't all communication handled by the 3cx system??)
I've advanced a little bit further: I opened the ports UDP 10000-65500 for send-receive for all my internal clients. Now I'm able to call someone, they can hear me, but I cannot hear them.
I've also created a listener for UDP ports 5060, 3478 and ports 9000-9007, but still no incoming sound...

The 3cx is behind an ISA2006 Firewall and for corporate security, I need as less ports open as possible...

3CX Support

You sohuld bound your VoIP provider to Media Server, and allow mapping of ports range 9000-9004 to your 3CX server. After that you will have incoming and outgoing sound. From the logs you've provided I see that 3CX attempts to make direct RTP connection to VoIP. It means that your VoIP is not bound to MS. To bind it you should open 'Edit VoIP provider' page and set checkmark in 'Bind device to Media Server'

Archie
3CX Sr. Coder

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